During a segment of “NBA on TNT,” 2007 Heisman Trophy winner Tim Tebow dropped into the studio and ran a few plays with Barkley and O’Neal. When the former quarterback handed off to O’Neal, Shaq made a beeline for Barkley and knocked him off balance.

When O’Neal challenged Barkley to tackle him, but Barkley demurred, saying he hurt his shoulder.

When Barkley switched to offense, he also avoided O’Neal, who was intent on delivering a hard hit.